Wilhelm schmidt



(No Model.)

W. SCHMIDT.

STEAM ENGINE.

'Patented Aug. 30, 1887.

m y WM= N. PETERS. Phwumagnpnef, wmangm". D. c.

UNITED STATES PATENT OFFICE.

WILHELM SCHMIDT, OF BRUNSWICK, BRUNSWICK, GERMANY.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 369,033, dated August 30, 1887.

Application filed January 12, 1887. Serial No. 924,158. (No model.) l

To all whom it may concern.'

Be it known that I, WILHELM SCHMIDT, engineer, a subject of the King of Prussia, residing at Brunswick, in the Duchy of Brunswick, German. Empire, have invented certain new and useful Improvements in Steam-Engines with Injectors, of which the following is a specification.

These improvements consist in conducting the steam coming from the steam-boiler, first, under the slide-valve of the steam-cylinder, and in admitting it from the space under the slide-valve immediately into the cylinder in order there to generate power. lBoiler-steam has hitherto always been conducted over the slide-valve into the slide-box, and from the latter it was then admitted into the steam-cylinder. This new way of introducing the steam under the slide-valve offersv the advantage that the steam coming from the boiler, which may be of a high pressure, does not come in contact with the stung-box of the slide-valve box, consequently steam of a very high pressure and highly heated can be used. Hitherto it has been impossible to use such steam on account of the packing of the stuffing-boxes, for the steam had an injurious effect on them and destroyed them.

The using of steam of a high pressure is in particular advantageous because it imparts a considerable amount of heat to the sides of the cylinder. These sides of the cylinder are continually kept hot, and therefore the cooled particles of steam cannot condense on them. It is well known that the condensing of the steam in the cylinder greatly diminishes the working power of the engine, which is avoided in this case by the introduction of highlyheated steam.

The method of introducing steam into the cylinder by conducting it first under the slidevalve is therefore of great advantage, and it is rendered still more so by combining this method of introducing the steam with an injector, as may be seen in the accompanying drawing, and this combination is claimed. By means of this combination, described hereinafter, it is not only possible to use steam of a very high tension, but it is also possible to turn it to the best account by expansion, as will be explained herein.

The drawing shows a cross-section of a steamcylinder to which the above-mentioned combination is applied.

The arrangement and the working of this machine are the following y M is the steam-cylinder, in which two pistons, L L', are working.

y z is the center partition of the cylinder.

R Bl p p are four steam-channels leading into the cylinder. The slide-valve is composed of four parts, m mn n', which are moved in common by the valve-rod t.

t is an expansion slide-valve of common construction and Way of working.

r3 is the steam-inlet pipe leading to the room O, which is situated under the slide-valve m m. l

1" is an injector-nozzle fed by the steampipe r.

The pipe r is in connection with a boiler of high pressure. The steam of high pressure escapes through the nozzle r and reaches the .pipe r3. During the escaping period of the steam the injector r sucks up steam out of r2, which leads to the slide-box S, and consequently steam is sucked up out of the latter. The steam that reaches r3 consists, therefore, in a mixture composed of steam of high pressure from pipe r and of steam coming from the slide-box S. The steam coming from S may,

vfor instance, have a pressure of six atmospheres and the steam of high pressure may be of eighteen atmospheres. Then the'steam that enters the room O will have a pressure of about twelve atmospheres. This steam of twelve atmospheres pressure in room O passes through the slide-valve m and channel B into the cylinder A. As the slide-valve m moves to the left, the communication between O and A shuts off, when the cylinder-room is about half full, for the slide-valve m covers the channel R. The steam then expands from twelve to six atmospheres, and when expanded the steam contained in room A enters the slidebox S with this pressure of sixv atmospheres. The high-pressure steam of twelve atmos` pheres contained in A has meanwhile heated the sides of the cylinder. During the back motion ofthe piston L the slide-box S comes in connection with the cylinder-room B', and steam with a pressure of six atmospheres enters the latter. In this room B the steam can expand, provided there is a suitable motion of the slide-valve from eight atmospheres to three IOG atmospheres. There is no reason to apprehend a noxious condensation of steam in this expansion, as the cylinder sides are still highly heated. This same effect is obtained on piston L, and the drawing shows the position in which the steam of six atmospheres contained in room A enters the slide-box7 and the steam comes from the slide-box S through channel p into the room B.

The steam that enters room B B', and which expands in the latter from six to three atmospheres, escapes after the expansion through channels p p into the pipes a: x', and can then further be used for any suitable purpose.

It is evident from what has just been said' that only a small portion of the steam that cntcrs the slide-box S from the room A A is conducted back into the room B B, owing to the expansion in this room. IThe remainder of the steam is sucked up out of the slide-box S through the pipe r2 and by the injector 0" and is compressed again by the latter. In this compressed state it is reconducted to the room O. One portion of this steam is therefore always performing a circular motion, whereas the remainder, which7 as regards quantity, corresponds with the quantity of the highpressure steam coming from the injector, is Withdrawn from this circular motion by its escaping through the pipes w x.

What I claim as my invention, and desir to secure by Letters Patent, is

The method of utilizing exhaust-steam by conducting the steam under the slide-valve after having previously applied a steam-in 35 jector, i", so that the steam operates at one side of the piston before entering the slide-box, and so that the exhaust-steam is sucked up in part ont of the slide-box by the steam-injector,

While the remainder of the steam is working 4o further by expansion on a steam-piston, substantially as described.

In witness whereof I have hereunto sct my hand in presence of two Witnesses.

WILHELM SCHMIDT. Vi tnesscs:

A. MHLNEY, B. ROI. 

